Behind Blue Plains Impoundment Lot: southeast corner of the lot on the
Maryland side of the fence, a short distance from the lightposts.
This is a replica stone created in 2015 and placed in early 2016.

The most direct way to reach the location is to take Oxon Hill
Farm Trail south from D.C. Village and then, after crossing the border into
Maryland, follow the access road along the chain link fence west until
you reach the back of the
impoundment lot. The direct walking route will almost certainly take you through some
very swampy territory, however.
A cleaner and easier route is to take the Oxon Hill Farm Trail
south from D.C. Village, and then, before crossing the bridge over Oxon Creek,
follow the unpaved path to the right southwest along the creek to the
large clearing with overhead power lines. Follow the clearing northwest
to the fence along the Maryland border and then walk a short distance
southwest along the fence to the corner of the impoundment lot.

The original stone was removed in 1958
during construction and then either lost or stolen from a storage
facility before it could be reset in the ground. On
March 23, 1962, DAR placed a new inscription-less stone
in the same location along with the original stone's iron fence.
By 1972, this stone too was in trouble, as
described by Edwin Darby Nye in a paper read that year before
the Columbia Historical Society:
"SE8, at the far end of the D.C. Village Area, has become a victim
of a large land-fill operation, involving the D.C. auto impounding
area, the new sewage treatment plant, and an eighteen-hole golf course
being constructed by the National Park Service. SE8 is covered with
some eight feet of landfill. A sixty-inch concrete pipe has been
placed over the stone, iron fencing and all, and a cover placed over it
to protect it. The stone has been uncovered and after excavation has been
completed it will be reset in a proper location."

Unfortunately,
nothing of the sort occurred, and the substitute stone was
completely covered by landfill until 1991 when the bicentennial
resurveying team dug it out of the ground, using old photos to
approximate its location. The team then decided
that the best way to preserve the stone was to
put it back underground,
this time protected by a taller pipe that was visible
above the surface. The substitute stone was removed in 2015
and replaced the next year with a replica of the original,
now at ground level.